<!DOCTYPE html>
<html lang="en" xmlns:th="https://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
username:<span th:text="${username}"></span><br>
session.login_user:<span th:text="${session.login_user}"></span><br>
</body>
</html>